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Yes.
Two vectors are identical when all their components are identical. An alternative definition, for vectors used in physics, is that they are identical when both the magnitude and the direction are identical.
"If two vector quantities are represented by two adjacent sides or a parallelogram then the diagonal of parallelogram will be equal to the resultant of these two vectors."
No.
180 degrees. Then the sum of the two vectors has a magnitude equal to the difference of their individual magnitudes.